In a decision issued late Friday afternoon, Colas argues that the law violates the constitutional rights of free speech and association.

He also says that it illegally creates two distinct classes of employees: "1) general municipal employees who are represented by a labor organization in bargaining and 2) general municipal employees who are not."

Act 10 eliminated collective bargaining rights for most public workers and prohibits the payroll deduction of membership dues for most unions. But public safety and transit unions are exempt under the law.

In a statement, Walker called Colas a "liberal activist judge" from Dane County who "wants to go backwards and take away the lawmaking responsibilities of the legislature and the governor."

Walker also said he was confident that the state would ultimately prevail in the appeals process.

The case was brought by Madison Teachers Inc. and Public Employees Local 61, a labor union representing city of Milwaukee employees.

In the wake of the tragic death of Tony Robinson, there are some things city government — meaning the mayor and the city council — can do, and should do. Right now. Commentary by Satya Conway-Rhodes.more »